So Tokumaru得丸 創生
Save contactI also engage in activities under the nickname Soumame (IPA: [soːmame]). I am a university student living in Japan who loves new things (in terms of engineering).
Birthday12/15/2006
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Meet So Tokumaru (Soumame)
So Tokumaru, also known online by his nickname Soumame, is a talented university student in Japan and a passionate innovator who loves exploring new frontiers in engineering and technology.
Recognized as a Mitou Junior 2024 Super Creator, So has an impressive track record of building, creating, and sharing his journey with the tech community. His remarkable achievements include winning the Championship (Minister of Internal Affairs and Communications Award) and the Technical Award in the AI Division at App Koshien 2024 for his TutoriaLLM project, which also earned the prestigious Visional Award.
So’s creativity extends across a wide array of domains:
- Hackathons & Competitions: He earned the Presentation Award at the TOMODACHI Boeing Entrepreneurship Seminar 2025, multiple awards at Gikuhaku 2025, and the CIVICTECH Award at Heroes League 2024. He is also an accomplished creator in the Minecraft community, with recognition in both the Minecraft Cup and international challenges.
- Hardware & Maker Culture: He is actively expanding his craft, having casually submitted his first piece of hardware to be accepted into Maker Faire Tokyo 2026.
- Sharing Knowledge: Through his blog, So writes engagingly about everything from AI agents, XR glasses, and machine learning to practical web development, digital organization, and personal reflections. He even builds custom tools for his own site, such as implementing an Obsidian-style graph view.
With a boundless curiosity for cutting-edge technology—ranging from artificial intelligence and spatial computing to community-driven development through Hack Club—So Tokumaru continues to inspire as a rising star in the tech world.
Exaggerated too much? There is a PDF.
Open the professional CV PDF2026/2
✈️TOMODACHI Boeing Entrepreneurship Seminar 2025
TOMODACHI Boeing Entrepreneurship Seminar 2025
Received the Presentation Award at the TOMODACHI Boeing Entrepreneurship Seminar 2025
🔨Gikuhaku 2025 Vol.6
Gikuhaku 2025 Vol.6
At Gikuhaku 2025 Vol.6, held on February 1, 2026, our team won multiple awards.
2024/12
🏆Heroes League 2024
Heroes League 2024
We received the CIVICTECH Award at the finals of MA's Heroes League 2024.
2024/11
🏆App Koshien 2024 — AI Division Technical Award & Championship
App Koshien 2024 — AI Division Technical Award & Championship
At "App Koshien 2024," an app development contest where middle and high school students from across Japan compete, the TutoriaLLM project advanced to the main tournament in the AI division and won the Technical Award and the Championship (Minister of Internal Affairs and Communications Award).
🏢Mitou Junior 2024
Mitou Junior 2024
Support for the TutoriaLLM project, which was selected for Mitou Junior 2024, concluded with the results presentation on November 4. On the same day, we received the Visional Award as a corporate prize from Visional, Inc. In addition, at the end of the same month we were recognized as a “Super Creator,” an accreditation given to creators who produced particularly notable achievements.
2023/12
🏆Minecraft Cup 2023
Minecraft Cup 2023
A world created by Team Ippanjin, a team composed of members ranging from elementary to high school students who operate on the internet, received an Encouragement Award at the Minecraft Cup regional tournament held in Japan.
2023/10
🏆Runner-up at Minecraft Education Challenge 2023
Runner-up at Minecraft Education Challenge 2023
The Minecraft world I created was selected as second place in the International Senior division of the Minecraft Education Challenge, organized by the Malaysian Ministry of Education, Sunway Malls, and Microsoft.
2022/1
🏆Minecraft Cup 2021
Minecraft Cup 2021
I competed with several friends in a competition that tested Minecraft skills and problem-solving abilities; we were finalists and received the Impress "Kids and IT" Award.
📷️Cameras Are Great, Aren't They?
Cameras Are Great, Aren't They?
A story about giving in to the recurring, roughly yearly urge to buy a camera.
❓An Era Where It's Hard to Learn from Side Effects
An Era Where It's Hard to Learn from Side Effects
If you came to learn something and found something interesting, and while investigating it you gradually gained new abilities... That's how I've increased my skills so far. But how will AI change that, and how should we design society so those losses don't occur?
💥Coolest Projects Japan 2026
Coolest Projects Japan 2026
I went to Coolest Projects Japan 2026, the first-ever exhibition event of its kind in Japan, so I'll introduce it here (it's scheduled to be held again next year).
🧱I Presented at the 7th Minecraft Cup (2025)
I Presented at the 7th Minecraft Cup (2025)
I had the opportunity to speak at the Minecraft Cup, an event that helped shape who I am today. There were things I didn't get to say, so I'll include those here in this blog post.
▲On My Birthday: Reflections Since Completing Mitou Junior
On My Birthday: Reflections Since Completing Mitou Junior
I'm Sosei Tokumaru, a Mitou Junior 2024 Super Creator who just turned 19. Since it might look like I've been quiet online after finishing Mitou Junior, I thought I'd share a public update on what I've been up to, as far as I'm able to.
🤖【Foreign License Conversion】I Converted My Malaysian Driver's License to a Japanese One
【Foreign License Conversion】I Converted My Malaysian Driver's License to a Japanese One
【Foreign License Conversion】I Converted My Malaysian Driver's License to a Japanese One Image from Gyazo Hello, I'm Soumame, 18 years old. I lived in Malaysia f
💩Looking Back Only at the Failures of 2024!
Looking Back Only at the Failures of 2024!
Looking Back Only at the Failures of 2024!
🤖Reflections on Mitou Junior
Reflections on Mitou Junior
Reflections on Mitou Junior This article is part of the Mitou Junior Advent Calendar. Long time no see — I'm Soumame (https://tokumaru.work/ja). I attended an A
🤖I Got My Driver's License in Malaysia
I Got My Driver's License in Malaysia
I Got My Driver's License in Malaysia Image from Gyazo Hi. I'm Soumame, 17 years old. The other day (well, some time ago), I was able to get a driver's license
🤖Looking Back Only at My Failures in 2023!
Looking Back Only at My Failures in 2023!
Looking Back Only at My Failures in 2023! For those thinking “This is just your opinion, right?” — yes, that's right. This post is mainly about personal experie
🤖What's VCE — the curriculum offered in Victoria, Australia?
What's VCE — the curriculum offered in Victoria, Australia?
What's VCE — the curriculum offered in Victoria, Australia? I'm a high school student currently in Year 11, and I've been attending Peninsula International Scho
🤖【Bedrock & Java】Convert a Minecraft World to 3D for Free!
【Bedrock & Java】Convert a Minecraft World to 3D for Free!
【Bedrock & Java】Convert a Minecraft World to 3D for Free! Image from Gyazo This topic gets asked quite often, so I’m putting it together here on note. For Bedro
🤖Air Tycoon Online 2 — Hardcore Credit Farming Playbook
Air Tycoon Online 2 — Hardcore Credit Farming Playbook
※This article is a work in progress and its contents may change in the future. I've read various articles and tried things; here I present the example that work
🤖[ATO2] List of the Most Important Early-Game Cities (Updating)
[ATO2] List of the Most Important Early-Game Cities (Updating)
[ATO2] List of the Most Important Early-Game Cities (Updating) I created a list of cities you should secure in the early game. Please take a look if you'd like.
2026/7
💼Melt Interface Technologies
Melt Interface Technologies
I work on software development at Melt Interface Technologies (MIT).
2026/1
💼Diver-X
Diver-X
I work as a software developer at Diver-X Inc. (part-time).
2025/9
🎓Keio University
Keio University
I enrolled in the Faculty of Environment and Information Studies at Keio University in September 2025.
2025/6
💼Specified Nonprofit Corporation Digital Manufacturing Council
Specified Nonprofit Corporation Digital Manufacturing Council
Specified Nonprofit Corporation Digital Manufacturing Council (Part-time)
2025/3
💼McDonald's Crew Member (Part-time)
McDonald's Crew Member (Part-time)
I worked as a McDonald's crew member (part-time).
2024/1
💼Classmall Kids Programming Instructor
Classmall Kids Programming Instructor
Until early 2024, I worked as an instructor for "Classmall Kids", an online programming school operated by YAGO Inc. I conducted lessons using the video game "Minecraft" and other formats.
2022/4
💼IDEACTIVE JAPAN PROJECT Student Ambassador
IDEACTIVE JAPAN PROJECT Student Ambassador
Responsible for marketing as a student ambassador for the IDEACTIVE JAPAN PROJECT, a business contest organized by five companies—Microsoft, SoftBank, Meta, VISITS, and the IoT Business Co-Creation Lab. Organized events such as the "IDEA CREATION WORKSHOP", a hackathon for elementary school students using Minecraft.
2020/1
🎓Peninsula International School Australia
Peninsula International School Australia
I attended Peninsula International School Australia from early 2020 to early 2025.
🔧Exhibiting at Maker Faire Tokyo 2026
Exhibiting at Maker Faire Tokyo 2026
I casually submitted my first piece of hardware and ended up getting accepted!?
💸AI Agent Billing Is Out of Control
AI Agent Billing Is Out of Control
A dialogue in which Soumame, who overuses AI agents even in part-time work, discusses the pain of costs and the dilemma of evaluating outcomes, and I lay out thoughts on securing funding and allocating responsibility.
🦞Creating a Blog Through Dialogue Using OpenClaw
Creating a Blog Through Dialogue Using OpenClaw
I think that even someone like me, who finds writing blog posts a hassle, may now be able to make my opinions more effectively conveyed through AI.
🍳XR's Use Might Be as a HUD - Let's Cook with AI
XR's Use Might Be as a HUD - Let's Cook with AI
I borrowed an inmo XR — Android-powered XR glasses — from Ukai, familiar from Mitou Junior, and did a little hackathon. After struggling with what to use it for, I built a cooking assistant to enjoy with an AI. I tried using the XR glasses to cook with AI, so I'll introduce that here.
🤝Inheritance of Digital Assets
Inheritance of Digital Assets
I entrust my information to various platforms, and I thought it would be a waste for those accesses to be frozen after I die, so I'm thinking about measures to pass those assets on to future generations.
💻A Recommendation for Hack Club
A Recommendation for Hack Club
I recommend Hack Club, an English-speaking community.
🦉How much machine learning does Duolingo use?
How much machine learning does Duolingo use?
I've heard that the language-learning app Duolingo uses machine learning everywhere — where exactly is it used? I looked into it.
🐳Quickly Set Up a Minecraft Server on macOS + Docker
Quickly Set Up a Minecraft Server on macOS + Docker
Operating a Minecraft server has become a fundamental skill it seems, so I'll jot down how to create one. (Source: Me) I hope to write a proper article someday, but for now, I'll just write it casually.
🗓️Thoughts on Life Logging Systems
Thoughts on Life Logging Systems
With the advancement of LLMs, it has become easier to verbalize human behavior and analyze conversations with others. However, I felt that none of it quite fit, so I thought about various aspects from both technical and usability perspectives.
🗺️Implemented a Graph View on My Blog
Implemented a Graph View on My Blog
I liked Obsidian's graph view, so I implemented it on my own website.
💻Let's Develop as a Team on GitHub
Let's Develop as a Team on GitHub
For those of you who have registered a GitHub account but don't use it because you're not a developer, here's a brief guide on how to use it.
🤖Can the use of LLMs be detected?
Can the use of LLMs be detected?
Have you ever been banned from using AI tools like ChatGPT (LLMs) at school? For a while OpenAI and others published experimental software to detect text written by LLMs, but nowadays such tools are hard to find. Is it actually possible to reliably detect the use of an LLM?
⚒️Introduction to Useful Tools for Team Development
Introduction to Useful Tools for Team Development
When starting team development, it's often difficult to decide how to work together. This article summarizes tools that may be useful in such cases.
✒️Markdown Syntax Cheat Sheet (Super Simple)
Markdown Syntax Cheat Sheet (Super Simple)
If you've used Google Docs or Word, Image from Gyazo you can select bold, italic, headings and so on like this. However, when using editors for writ
♻️Super Large Refactoring After Finishing MITOU Junior
Super Large Refactoring After Finishing MITOU Junior
Hello. I'm Souma. :::message This article is part of the MITOU Junior Advent Calendar. ::: Today, I'd like to talk about a large-scale refactoring of the app I
🤖I Want to Incorporate LLM into Visual Programming (Blockly × LLM)
I Want to Incorporate LLM into Visual Programming (Blockly × LLM)
Hello everyone. My name is Sousei Tokumaru, also known as Sōmame. About a year ago, I became deeply fascinated with web application development using Typescript
🤖Let's Read Google Sheets via API!
Let's Read Google Sheets via API!
Let's Read Google Sheets via API! Image from Gyazo This is a re-publication of an article I wrote on another site last year. It's super easy. I'll explain how t
🤖You Only Need HTML! Build a Blog Site with Astro!
You Only Need HTML! Build a Blog Site with Astro!
You Only Need HTML! Build a Blog Site with Astro! Image from Gyazo Sometimes you just feel like building a blog site. For sites of a certain size, you don't nee
🤖How to Conduct Bitcoin Transactions Without Using Blockchain (Off-Chain)
How to Conduct Bitcoin Transactions Without Using Blockchain (Off-Chain)
How to Conduct Bitcoin Transactions Without Using Blockchain (Off-Chain) This article is a re-upload of an article I wrote a while ago. When people hear the ter
🤖How to Create Automated Notifications for Free Using Functions in Notion
How to Create Automated Notifications for Free Using Functions in Notion
How to Create Automated Notifications for Free Using Functions in Notion Image from Gyazo Notion is convenient, isn't it? I also migrated from Trello and find i
🤖How to Mine with Nicehash
How to Mine with Nicehash
How to Mine with Nicehash Image from Gyazo Here's a quick explanation. What You Need 1. A computer 2. An email address Creating a Nicehash Account First, go to
🔤Thick-Cut JSON
Thick-Cut JSON
"Why JSON format!?!?" "Why can't you write comments!? Didn't they say it's a format for humans to read!? They force us to use it as a config file but won't let us leave notes—what kind of cruelty is that!? Have you ever thought about how it feels for engineers who have to create a dummy key like "comment1": "ここは本番のURL"?"
💬Consolidate All Your Messaging Apps with Beeper
Consolidate All Your Messaging Apps with Beeper
Combine LINE, Instagram, Messenger, X, Slack, Discord, and more into a single app. It also runs on PC, which is super convenient.
🧮Starting University and Struggling with Mathematics
Starting University and Struggling with Mathematics
Entering university made me realize the importance of mathematics.
❤I Want to Be Cute
I Want to Be Cute
Even if you're a man and you accept that about yourself, there are times when you want to be cute, right? But why is that?
🌐Studying Abroad
Studying Abroad
I just spoke some random thoughts and transcribed them. Lately I've been wanting to go abroad, even though I haven't really thought about the reason. When I tho
🧠A Dream When I Felt Really Sick
A Dream When I Felt Really Sick
I caught a cold this weekend and stayed in bed at home, but that morning I had a really strange dream. An influenza funeral or something — it happens sometimes, right?
🗣️Communication Through Computers
Communication Through Computers
There are visual, auditory, tactile modalities, and more—but how has communication using computers changed?
❓Concerns About My Career
Concerns About My Career
I sometimes don't know what I should do.
🎇Life Is Short
Life Is Short
When I think about it, I'm 20 years old this year — how many more years will I live?
🔌Household Appliances Are Amazing When You Think About It
Household Appliances Are Amazing When You Think About It
When I paid attention to the appliances around me, I realized that the household devices we take for granted actually use very advanced technology.
🍚My Rice Cooker Never Breaks
My Rice Cooker Never Breaks
Most of the rice I've eaten in my life was cooked by a Sanyo rice cooker. According to Google, the typical lifespan of a rice cooker is said to be 3 to 6 years, but I've been using mine for at least 15 years. What's going on???
♻️It's 2026.
It's 2026.
It's 2026. That means 2025 is over. I want to say plainly: the New Year is a new year.
🤖On LLMs Encouraging Harmful Behavior in People
On LLMs Encouraging Harmful Behavior in People
I learned that some people claim LLMs are assisting suicide, and now that many people casually use these mysterious black-box LLMs, I want to think about how I should relate to LLMs.
📉AI-Driven Democratization of Learning and the "Compensation" Dilemma for Knowledge Producers
AI-Driven Democratization of Learning and the "Compensation" Dilemma for Knowledge Producers
From an era of buying books to learn to an era of asking AI. I consider the potential "stagnation of knowledge" that could result from the breakdown of returns to people who produce knowledge behind that convenience.
🍠Can't Buy What I Want
Can't Buy What I Want
Probably everyone except the extremely wealthy faces this problem
🤖On Not Being Able to Keep Up with Recent AI Advances
On Not Being Able to Keep Up with Recent AI Advances
LLMs, image generation, and other advances are happening so fast that keeping up has become a hassle.
🪨Isn't Obsidian way too useful?
Isn't Obsidian way too useful?
I also write this blog in Obsidian.
📡WebSocket
WebSocket
I get the impression that WebSocket is used in a lot of places.
👥File access permissions on UNIX-like systems such as Linux
File access permissions on UNIX-like systems such as Linux
About access permissions for UNIX-like systems such as Linux
🌐WWW Notes
WWW Notes
The World Wide Web (WWW) came up in class, so I took notes and decided to publish them on the web.
💻Getting Started with tldraw
Getting Started with tldraw
A short guide to the online whiteboard tldraw.
⚒️GitHub Student Pack
GitHub Student Pack
What is the GitHub Student Pack? The GitHub Student Pack is the name of a package in which GitHub offers students paid software, free server credits, GitHub Pro
🗒️Markup Languages
Markup Languages
People often call it a markup language; isn't it a programming language?
🗒️What is HTML
What is HTML
The role of HTML HTML stands for HyperText Markup Language, and is a language for describing hypertext. Hypertext is a text file that has a mechanism for linkin